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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace Phpdftk\WptHarness; |
| 6 | |
| 7 | /** |
| 8 | * Shell wrapper around `scripts/cross-browser/render.mjs` (Chromium and |
| 9 | * WebKit) and `scripts/cross-browser/render-docker.sh` (Firefox via the |
| 10 | * Docker image) for the cross-browser PDF oracle. |
| 11 | * |
| 12 | * The oracle is a slow, side-effecting operation — each render boots a |
| 13 | * browser engine and emits a real PDF. We cache aggressively: keyed on |
| 14 | * the SHA-256 of the test bytes plus engine identifier plus a "cache |
| 15 | * generation" string (so bumping Playwright / WebKit / Firefox versions |
| 16 | * invalidates everything in one move). |
| 17 | * |
| 18 | * On a cache hit we return the cached PDF immediately. On a miss we |
| 19 | * shell out to the right CLI, store the PDF, and return its path. |
| 20 | * |
| 21 | * Engine availability is checked lazily — if `node` isn't on `PATH` |
| 22 | * (Chromium) or `docker` isn't running (Firefox) or the Swift binary |
| 23 | * isn't built (WebKit), the engine is reported as unavailable and the |
| 24 | * runner skips it instead of failing the whole test. |
| 25 | */ |
| 26 | final class BrowserOracle |
| 27 | { |
| 28 | /** |
| 29 | * Engine → port offset for the daemon-base URL. The full URL is |
| 30 | * `${daemonBase}${offset}/render`, so `--daemon-base=http://127.0.0.1:910` |
| 31 | * routes to 9101 / 9102 / 9103. Keep in sync with the port |
| 32 | * declarations in compose.yaml. |
| 33 | */ |
| 34 | private const ENGINE_PORTS = [ |
| 35 | 'chromium' => 1, |
| 36 | 'firefox' => 2, |
| 37 | 'webkit' => 3, |
| 38 | ]; |
| 39 | |
| 40 | public function __construct( |
| 41 | /** |
| 42 | * Absolute path to the repo's `scripts/cross-browser/` directory. |
| 43 | * Defaults to a relative path resolved from this file's location. |
| 44 | */ |
| 45 | private readonly string $scriptDir = __DIR__ . '/../../../scripts/cross-browser', |
| 46 | /** |
| 47 | * Cache directory for rendered PDFs. Gitignored. Lives under |
| 48 | * `var/wpt/browser-cache/` by default; per-engine subdirs keep |
| 49 | * the listing legible. |
| 50 | */ |
| 51 | private readonly string $cacheDir = __DIR__ . '/../../../var/wpt/browser-cache', |
| 52 | /** |
| 53 | * Single-string knob to invalidate every cache entry at once. |
| 54 | * Bumped when any browser version moves. Combined with the |
| 55 | * test-bytes hash to form the cache key. |
| 56 | */ |
| 57 | private readonly string $cacheGeneration = 'pw-1.49.1-ff-latest-wk-26.0', |
| 58 | private readonly string $nodeBinary = 'node', |
| 59 | private readonly string $dockerBinary = 'docker', |
| 60 | /** |
| 61 | * Base URL of the engine daemon cluster. When set, every render |
| 62 | * goes through HTTP POST to `${daemonBase}${portOffset}/render` |
| 63 | * instead of forking `node render.mjs`. Null = legacy one-shot |
| 64 | * fork mode (used by dev hosts that don't want to bring up the |
| 65 | * compose stack). |
| 66 | * |
| 67 | * Example: `--daemon-base=http://127.0.0.1:910` → chromium |
| 68 | * runs on :9101, firefox on :9102, webkit on :9103. |
| 69 | */ |
| 70 | private readonly ?string $daemonBase = null, |
| 71 | /** |
| 72 | * When daemon-mode is on, fixture paths arrive as absolute |
| 73 | * host paths (e.g. `/Users/x/repo/vendor-data/wpt/foo.html`) |
| 74 | * but the daemon needs the in-container view (`/wpt/foo.html`). |
| 75 | * We rewrite the prefix via `hostWptRoot` → `daemonWptRoot`. |
| 76 | * Auto-resolved from `vendor-data/wpt` when null. |
| 77 | */ |
| 78 | private readonly ?string $hostWptRoot = null, |
| 79 | private readonly string $daemonWptRoot = '/wpt', |
| 80 | ) {} |
| 81 | |
| 82 | /** |
| 83 | * Render `$testPath` through `$engine` and return the path to the |
| 84 | * resulting PDF. The path is owned by the cache — the caller MUST |
| 85 | * NOT unlink it. Returns null when the engine isn't available on |
| 86 | * this host; raises on a hard render failure (engine present but |
| 87 | * the PDF generation went wrong). |
| 88 | */ |
| 89 | public function render(string $engine, string $testPath): ?string |
| 90 | { |
| 91 | if (!is_file($testPath)) { |
| 92 | throw new \RuntimeException("test fixture not found: $testPath"); |
| 93 | } |
| 94 | if (!$this->isAvailable($engine)) { |
| 95 | return null; |
| 96 | } |
| 97 | $cached = $this->cachedPath($engine, $testPath); |
| 98 | if (is_file($cached)) { |
| 99 | return $cached; |
| 100 | } |
| 101 | $this->ensureCacheDir($engine); |
| 102 | $tmp = $cached . '.tmp.' . bin2hex(random_bytes(4)); |
| 103 | try { |
| 104 | $this->dispatch($engine, $testPath, $tmp); |
| 105 | if (!is_file($tmp) || filesize($tmp) === 0) { |
| 106 | throw new \RuntimeException("$engine produced empty PDF for $testPath"); |
| 107 | } |
| 108 | // Atomic publish: rename is atomic on POSIX so concurrent |
| 109 | // callers don't race on a half-written cache file. |
| 110 | rename($tmp, $cached); |
| 111 | return $cached; |
| 112 | } catch (\Throwable $err) { |
| 113 | @unlink($tmp); |
| 114 | throw $err; |
| 115 | } |
| 116 | } |
| 117 | |
| 118 | /** |
| 119 | * Available-engine probe. Each engine has a different signal: |
| 120 | * |
| 121 | * - `chromium` — node + render.mjs + Playwright's bundled Chromium. |
| 122 | * We check node exists; the Playwright install is a hard |
| 123 | * runtime error if it's missing, which is sensible. |
| 124 | * - `firefox` — on macOS hosts, the system Firefox.app is used |
| 125 | * directly (`--screenshot` path in render.mjs because |
| 126 | * `--print-to-pdf` hangs the SWGL compositor on arm64). On |
| 127 | * everything else, the docker daemon must be reachable so |
| 128 | * render-docker.sh can drop into the Linux container. |
| 129 | * - `webkit` — `webkit-render` binary at the configured path |
| 130 | * (defaults to `/usr/local/bin/webkit-render`; override with |
| 131 | * the `WEBKIT_CLI` env in render.mjs). |
| 132 | */ |
| 133 | public function isAvailable(string $engine): bool |
| 134 | { |
| 135 | if ($this->daemonBase !== null) { |
| 136 | return $this->daemonReady($engine); |
| 137 | } |
| 138 | return match ($engine) { |
| 139 | 'chromium' => $this->binaryAvailable($this->nodeBinary), |
| 140 | 'firefox' => $this->firefoxAvailable(), |
| 141 | 'webkit' => is_file( |
| 142 | getenv('WEBKIT_CLI') ?: '/usr/local/bin/webkit-render', |
| 143 | ), |
| 144 | default => false, |
| 145 | }; |
| 146 | } |
| 147 | |
| 148 | /** |
| 149 | * Probe `${daemonBase}${port}/status` and treat a 200 with |
| 150 | * `ready: true` as available. Short timeout — if the daemon isn't |
| 151 | * up we want the sweep to skip the engine, not stall. |
| 152 | */ |
| 153 | private function daemonReady(string $engine): bool |
| 154 | { |
| 155 | $url = $this->daemonUrlFor($engine, '/status'); |
| 156 | if ($url === null) { |
| 157 | return false; |
| 158 | } |
| 159 | $ch = curl_init($url); |
| 160 | curl_setopt_array($ch, [ |
| 161 | CURLOPT_RETURNTRANSFER => true, |
| 162 | CURLOPT_TIMEOUT_MS => 2000, |
| 163 | CURLOPT_CONNECTTIMEOUT_MS => 500, |
| 164 | CURLOPT_FAILONERROR => false, |
| 165 | ]); |
| 166 | $body = curl_exec($ch); |
| 167 | $code = curl_getinfo($ch, CURLINFO_HTTP_CODE); |
| 168 | curl_close($ch); |
| 169 | if ($code !== 200 || !is_string($body)) { |
| 170 | return false; |
| 171 | } |
| 172 | $decoded = json_decode($body, true); |
| 173 | return is_array($decoded) && ($decoded['ready'] ?? false) === true; |
| 174 | } |
| 175 | |
| 176 | private function daemonUrlFor(string $engine, string $path): ?string |
| 177 | { |
| 178 | if ($this->daemonBase === null) { |
| 179 | return null; |
| 180 | } |
| 181 | $offset = self::ENGINE_PORTS[$engine] ?? null; |
| 182 | if ($offset === null) { |
| 183 | return null; |
| 184 | } |
| 185 | return rtrim($this->daemonBase, '/') . $offset . $path; |
| 186 | } |
| 187 | |
| 188 | private function firefoxAvailable(): bool |
| 189 | { |
| 190 | if ($this->macFirefoxPath() !== null) { |
| 191 | return $this->binaryAvailable($this->nodeBinary); |
| 192 | } |
| 193 | return $this->binaryAvailable($this->dockerBinary) |
| 194 | && $this->dockerDaemonRunning(); |
| 195 | } |
| 196 | |
| 197 | private function macFirefoxPath(): ?string |
| 198 | { |
| 199 | if (PHP_OS_FAMILY !== 'Darwin') { |
| 200 | return null; |
| 201 | } |
| 202 | $envBin = getenv('FIREFOX_CLI'); |
| 203 | if (is_string($envBin) && $envBin !== '' && is_file($envBin)) { |
| 204 | return $envBin; |
| 205 | } |
| 206 | $app = '/Applications/Firefox.app/Contents/MacOS/firefox'; |
| 207 | return is_file($app) ? $app : null; |
| 208 | } |
| 209 | |
| 210 | /** |
| 211 | * Return the cache key + final path for `(engine, testPath)`. Public |
| 212 | * so callers (e.g. CI) can pre-warm the cache. |
| 213 | */ |
| 214 | public function cachedPath(string $engine, string $testPath): string |
| 215 | { |
| 216 | $key = hash('sha256', (string) file_get_contents($testPath)) |
| 217 | . '-' . $this->cacheGeneration |
| 218 | . '-' . $engine; |
| 219 | return $this->cacheDir . '/' . $engine . '/' . substr($key, 0, 64) . '.pdf'; |
| 220 | } |
| 221 | |
| 222 | /** |
| 223 | * For diagnostics: clear every cached PDF for one engine. CI uses |
| 224 | * this when bumping browser versions. |
| 225 | */ |
| 226 | public function clearCache(string $engine): void |
| 227 | { |
| 228 | $dir = $this->cacheDir . '/' . $engine; |
| 229 | if (!is_dir($dir)) { |
| 230 | return; |
| 231 | } |
| 232 | foreach (glob($dir . '/*.pdf') ?: [] as $file) { |
| 233 | @unlink($file); |
| 234 | } |
| 235 | } |
| 236 | |
| 237 | private function dispatch(string $engine, string $testPath, string $outPath): void |
| 238 | { |
| 239 | if ($this->daemonBase !== null) { |
| 240 | $this->dispatchDaemon($engine, $testPath, $outPath); |
| 241 | return; |
| 242 | } |
| 243 | switch ($engine) { |
| 244 | case 'chromium': |
| 245 | $cmd = sprintf( |
| 246 | '%s %s chromium %s --output=%s 2>&1', |
| 247 | escapeshellcmd($this->nodeBinary), |
| 248 | escapeshellarg($this->scriptDir . '/render.mjs'), |
| 249 | escapeshellarg($testPath), |
| 250 | escapeshellarg($outPath), |
| 251 | ); |
| 252 | break; |
| 253 | case 'webkit': |
| 254 | $cmd = sprintf( |
| 255 | '%s %s webkit %s --output=%s 2>&1', |
| 256 | escapeshellcmd($this->nodeBinary), |
| 257 | escapeshellarg($this->scriptDir . '/render.mjs'), |
| 258 | escapeshellarg($testPath), |
| 259 | escapeshellarg($outPath), |
| 260 | ); |
| 261 | break; |
| 262 | case 'firefox': |
| 263 | $macFf = $this->macFirefoxPath(); |
| 264 | if ($macFf !== null) { |
| 265 | // macOS hosts run Firefox natively through render.mjs; |
| 266 | // render-docker.sh is the Linux fallback. |
| 267 | $env = 'FIREFOX_CLI=' . escapeshellarg($macFf) . ' '; |
| 268 | $cmd = $env . sprintf( |
| 269 | '%s %s firefox %s --output=%s 2>&1', |
| 270 | escapeshellcmd($this->nodeBinary), |
| 271 | escapeshellarg($this->scriptDir . '/render.mjs'), |
| 272 | escapeshellarg($testPath), |
| 273 | escapeshellarg($outPath), |
| 274 | ); |
| 275 | break; |
| 276 | } |
| 277 | $cmd = sprintf( |
| 278 | '%s %s %s %s 2>&1', |
| 279 | escapeshellcmd($this->scriptDir . '/render-docker.sh'), |
| 280 | 'firefox', |
| 281 | escapeshellarg($testPath), |
| 282 | escapeshellarg($outPath), |
| 283 | ); |
| 284 | break; |
| 285 | default: |
| 286 | throw new \RuntimeException("unknown engine: $engine"); |
| 287 | } |
| 288 | exec($cmd, $output, $status); |
| 289 | if ($status !== 0) { |
| 290 | $err = implode("\n", $output); |
| 291 | throw new \RuntimeException("$engine render failed (exit $status): $err"); |
| 292 | } |
| 293 | } |
| 294 | |
| 295 | /** |
| 296 | * Post the fixture to the engine daemon and write the returned |
| 297 | * PDF bytes to `$outPath`. The daemon expects fixture paths under |
| 298 | * its own WPT root (mounted as `/wpt/` in the canonical compose |
| 299 | * setup); we translate the host path before sending. |
| 300 | * |
| 301 | * The daemon also writes its own atomic cache copy keyed on |
| 302 | * `cache_key`. The calling render() then renames `$outPath` into |
| 303 | * the same final path — both writes land on the same file with |
| 304 | * identical bytes, which is harmless duplication that we accept |
| 305 | * to keep both sides of the cache symmetric. |
| 306 | */ |
| 307 | private function dispatchDaemon(string $engine, string $testPath, string $outPath): void |
| 308 | { |
| 309 | $url = $this->daemonUrlFor($engine, '/render'); |
| 310 | if ($url === null) { |
| 311 | throw new \RuntimeException("daemon URL unavailable for engine $engine"); |
| 312 | } |
| 313 | $payload = json_encode([ |
| 314 | 'fixture' => $this->translateFixturePath($testPath), |
| 315 | 'cache_key' => $this->cacheKey($engine, $testPath), |
| 316 | 'viewport' => ['width' => 816, 'height' => 1056], |
| 317 | 'timeout_ms' => 60000, |
| 318 | ], JSON_UNESCAPED_SLASHES); |
| 319 | if ($payload === false) { |
| 320 | throw new \RuntimeException("failed to encode daemon request for $testPath"); |
| 321 | } |
| 322 | $ch = curl_init($url); |
| 323 | curl_setopt_array($ch, [ |
| 324 | CURLOPT_RETURNTRANSFER => true, |
| 325 | CURLOPT_POST => true, |
| 326 | CURLOPT_HTTPHEADER => ['content-type: application/json'], |
| 327 | CURLOPT_POSTFIELDS => $payload, |
| 328 | CURLOPT_TIMEOUT => 90, // > daemon's 60s render budget, < forever |
| 329 | CURLOPT_CONNECTTIMEOUT => 5, |
| 330 | ]); |
| 331 | $body = curl_exec($ch); |
| 332 | $code = curl_getinfo($ch, CURLINFO_HTTP_CODE); |
| 333 | $err = curl_error($ch); |
| 334 | curl_close($ch); |
| 335 | if ($body === false) { |
| 336 | throw new \RuntimeException("$engine daemon request failed: $err"); |
| 337 | } |
| 338 | $decoded = json_decode((string) $body, true); |
| 339 | if (!is_array($decoded)) { |
| 340 | throw new \RuntimeException( |
| 341 | "$engine daemon returned non-JSON (HTTP $code): " . substr((string) $body, 0, 200), |
| 342 | ); |
| 343 | } |
| 344 | if ($code !== 200) { |
| 345 | $msg = $decoded['error'] ?? 'unknown daemon error'; |
| 346 | throw new \RuntimeException("$engine daemon HTTP $code: $msg"); |
| 347 | } |
| 348 | $b64 = $decoded['pdf_bytes_base64'] ?? null; |
| 349 | if (!is_string($b64) || $b64 === '') { |
| 350 | throw new \RuntimeException("$engine daemon returned no PDF bytes"); |
| 351 | } |
| 352 | $bytes = base64_decode($b64, strict: true); |
| 353 | if ($bytes === false || $bytes === '') { |
| 354 | throw new \RuntimeException("$engine daemon returned malformed base64"); |
| 355 | } |
| 356 | file_put_contents($outPath, $bytes); |
| 357 | } |
| 358 | |
| 359 | /** |
| 360 | * Translate a host fixture path into the daemon-visible path. The |
| 361 | * daemon sees the WPT corpus at `daemonWptRoot` (default `/wpt`); |
| 362 | * the host sees it wherever `hostWptRoot` resolves to (default |
| 363 | * `vendor-data/wpt` relative to the repo). |
| 364 | */ |
| 365 | private function translateFixturePath(string $hostPath): string |
| 366 | { |
| 367 | $hostRoot = $this->hostWptRoot ?? realpath(__DIR__ . '/../../../vendor-data/wpt'); |
| 368 | if (!is_string($hostRoot) || $hostRoot === '') { |
| 369 | return $hostPath; |
| 370 | } |
| 371 | $real = realpath($hostPath) ?: $hostPath; |
| 372 | if (str_starts_with($real, $hostRoot . '/')) { |
| 373 | return $this->daemonWptRoot . substr($real, strlen($hostRoot)); |
| 374 | } |
| 375 | return $hostPath; |
| 376 | } |
| 377 | |
| 378 | /** |
| 379 | * First-64-hex-chars of the cache key (matches the substring |
| 380 | * pulled in `cachedPath()`). Daemons receive this as `cache_key` |
| 381 | * in the request body and use it directly as the cache filename |
| 382 | * stem. |
| 383 | */ |
| 384 | private function cacheKey(string $engine, string $testPath): string |
| 385 | { |
| 386 | $key = hash('sha256', (string) file_get_contents($testPath)) |
| 387 | . '-' . $this->cacheGeneration |
| 388 | . '-' . $engine; |
| 389 | return substr($key, 0, 64); |
| 390 | } |
| 391 | |
| 392 | private function binaryAvailable(string $binary): bool |
| 393 | { |
| 394 | $cmd = sprintf('command -v %s >/dev/null 2>&1', escapeshellcmd($binary)); |
| 395 | exec($cmd, $_, $status); |
| 396 | return $status === 0; |
| 397 | } |
| 398 | |
| 399 | private function dockerDaemonRunning(): bool |
| 400 | { |
| 401 | $cmd = sprintf('%s info >/dev/null 2>&1', escapeshellcmd($this->dockerBinary)); |
| 402 | exec($cmd, $_, $status); |
| 403 | return $status === 0; |
| 404 | } |
| 405 | |
| 406 | private function ensureCacheDir(string $engine): void |
| 407 | { |
| 408 | $dir = $this->cacheDir . '/' . $engine; |
| 409 | if (!is_dir($dir)) { |
| 410 | @mkdir($dir, 0775, recursive: true); |
| 411 | } |
| 412 | } |
| 413 | } |